| `minio_cluster_usage_object_total`           | Total number of objects in a cluster                           |
| `minio_cluster_usage_total_bytes`            | Total cluster usage in bytes                                   |
| `minio_cluster_usage_version_total`          | Total number of versions (includes delete marker) in a cluster |

  periodSeconds: 15
  timeoutSeconds: 10
  successThreshold: 1
  failureThreshold: 3
```

## Cluster probe

### Cluster-writeable probe

The reply is '200 OK' if cluster has write quorum if not it returns '503 Service Unavailable'.

```
curl http://minio1:9001/minio/health/cluster
HTTP/1.1 503 Service Unavailable
Accept-Ranges: bytes
Content-Length: 0
Server: MinIO
Vary: Origin

                runnerNonInputProperties.systemProperty(TESTS_REST_CLUSTER, () -> String.join(",", cluster.getAllHttpSocketURI()));
                runnerNonInputProperties.systemProperty(TESTS_CLUSTER, () -> String.join(",", cluster.getAllTransportPortURI()));
                runnerNonInputProperties.systemProperty(TESTS_CLUSTER_NAME, cluster::getName);
            } else {

func TestUnPath(t *testing.T) {
	result1 := msgUnPath("/skydns/local/cluster/staging/service/")
	if result1 != "service.staging.cluster.local.skydns" {
		t.Errorf("Failure to get domain from etcd key (with a trailing '/'), expect: 'service.staging.cluster.local.', actually get: '%s'", result1)
	}

	result2 := msgUnPath("/skydns/local/cluster/staging/service")
	if result2 != "service.staging.cluster.local.skydns" {

        this.indicesTimeout = timeout;
    }

    /**
     * Gets the cluster timeout.
     * @return The cluster timeout.
     */
    public String getClusterTimeout() {
        return clusterTimeout;
    }

    /**
     * Sets the cluster timeout.
     * @param timeout The cluster timeout.
     */
    public void setClusterTimeout(final String timeout) {

- Kubeadm: fix a regression where the KubeletConfiguration is not properly downloaded during "kubeadm upgrade" commands from the kube-system/kubelet-config ConfigMap, resulting in...

import org.elasticsearch.Version;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.cluster.metadata.Metadata;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardRoutingState;

	clusterHealthCollectorPath       collectorPath = "/cluster/health"
	clusterUsageObjectsCollectorPath collectorPath = "/cluster/usage/objects"
	clusterUsageBucketsCollectorPath collectorPath = "/cluster/usage/buckets"
	clusterErasureSetCollectorPath   collectorPath = "/cluster/erasure-set"
	clusterIAMCollectorPath          collectorPath = "/cluster/iam"
	clusterConfigCollectorPath       collectorPath = "/cluster/config"

## Healthcheck Probe

MinIO server has two healthcheck related un-authenticated endpoints, a liveness probe to indicate if server is responding, cluster probe to check if server can be taken down for maintenance.

- Liveness probe available at `/minio/health/live`
- Cluster probe available at `/minio/health/cluster`

Read more on how to use these endpoints in [MinIO healthcheck guide](https://github.com/minio/minio/blob/master/docs/metrics/healthcheck/README.md).

- `etcd: Update etcd to `v3.6.6`. (#135271, @bzsuni) [SIG API Machinery, Cloud Provider, Cluster Lifecycle, Etcd and Testing]